US4136379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoflash lamp array having reflective circuit board
Assignee: General Electric Co
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Filing: 1977-08-18
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Granted: 1979-01-23
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Expires: 1997-08-18
Abstract
Abstract A photoflash lamp array comprising a plastic housing containing flash lamps positioned over a circuit board carrying switching circuitry for sequentially firing the flash lamps. The circuit board is made of an electrically insulating material having a light-reflecting surface for reflecting light when the lamps are flashed. The front of the housing is provided with prisms to improve the distribution pattern of light when the lamps are flashed.
Inventors
- 👤 Harihar D. Chevali
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:52
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0442; H; H05; H05K; H05K1/00; H05K1/02; H05K1/0274
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A photoflash lamp array comprising a plurality of flash lamps, and a circuit board carrying circuitry for sequentially firing said flash lamps, said flash lamps being positioned over a surface of said circuit board and connected electrically to said circuitry, said circuit board being made of an electrically insulative light-reflecting material, said surface of the circuit board functioning as a reflector of light from said lamps when flashed.
Claim 2
Dependent Claim
68 words
A photoflash lamp array comprising a plurality of flash lamps, and a circuit board carrying circuitry for sequentially firing said flash lamps, said flash lamps being positioned over a surface of said circuit board and connected electrically to said circuitry, said circuit board being made of an electrically insulative light-reflecting material, said surface of the circuit board functioning as a reflector of light from said lamps when flashed.
Claim 3
Dependent Claim
20 words
An array as claimed in claim 1, in which said circuit board material is polystyrene containing titanium dioxide interspersed therein.
Claim 4
Dependent Claim
26 words
An array as claimed in claim 2, in which the amount of said titanium dioxide is about one to ten percent by weight of said polystyrene.
Claim 5
Dependent Claim
44 words
An array as claimed in claim 1, including a light-transmissive cover in front of said lamps and circuit board, one or both surfaces of said cover being provided with prism means for increasing the illumination in a picture-scene area when said lamps are flashed.
Claim 6
Dependent Claim
38 words
An array as claimed in claim 1, in which said circuitry comprises electrically conductive circuit runs on said surface of the circuit board and over portions of the areas thereof which reflect light when the lamps are flashed.
Claim 7
Dependent Claim
17 words
An array as claimed in claim 5, in which said circuit runs are made of light-reflecting material.
References Cited (Backward Citations)
US3614412A
Cited
US3725693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |